Skip the auto shop - Our mechanics make house calls

How Much Does the AC Affect Fuel Mileage

fuel mileage

Your car’s air conditioner is an important accessory – it helps keep you and your passengers comfortable and safe during hot weather. However, it’s operated by your engine and places an additional load on your engine when it’s running. That means it increases your fuel expenditure (decreases your fuel economy). How much does it affect your fuel mileage? The answer is: a lot.

How much will my fuel mileage be affected?

Note that there is no single answer to this question, as there are a number of different factors in play. The actual temperature outside will have an effect, as will the size of your engine, the make and model of your car, the condition of your air conditioning system and many others. However, the US EPA notes that running the air conditioner in very hot weather can increase your fuel consumption by up to 25%, and that the effect of using the AC in a hybrid or electric vehicle can be even greater.

The best defense against decreasing fuel economy is actually pretty simple – use your windows at lower speeds, and turn on the air when you hit the highway. Of course, open windows increase drag, which also reduces fuel economy, but the impact isn’t as great as running the AC at lower speeds.

Ensuring that your air conditioning system and engine are properly maintained will also help improve your fuel economy. Regular oil changes and clean air filters can do a great deal to improve your fuel mileage. Ensuring that your AC system has the right level of refrigerant is also an important consideration here.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
Icon-warranty_badge-02

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.

GET A QUOTE

More related articles

P0222 OBD-II Trouble Code: Throttle/Pedal Position Switch/Sensor B Circuit Low Input
P0222 code definition Throttle/Pedal Position Switch/Sensor B Circuit Low Input What the P0222 code means The manufacturer specifies a range of acceptable voltage to be produced from the throttle position...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How to Transfer a Car Title in Idaho
In order to prove ownership of a car, you must have the title. However, when a car is sold, given away or inherited, the title needs...


Related questions

Q: Cooling Fans

The engine fans should turn on based on engine temperature. If the sensors you just replaced are not connected properly, it would cause them to fail. When repairs have been made recently, always verify they are holding. Have you checked...

Q: How Much Does Using the AC Affect Fuel Economy

There are several variables that will influence the answer to that. It depends on your vehicle, how you drive, where you drive, and how hot it is outside. But there are some things that are certain: operating an A/C system...

Q: AC not working

Hi. If the pressure in the AC system isn't enough, the computer will never cycle the compressor on and no cold air will flow, I suggest having the car tested for leaks. If no leaks are present, a certified mechanic,...